stadio: Court 12 Round: 25
| ITF Malesia F2 | 2018/07/10 03:50 | Rhett Purcell v Seong-Gook Oh | 7-6,7-5 |
| ITF Malesia F1 | 2018/07/04 03:30 | Soichiro Moritani v Seong-Gook Oh | 6-4,6-0 |
| ITF Malesia F1 | 2018/07/03 10:05 | Seong-Gook Oh v Sang-Woo Noh | 7-6,6-2 |
| ITF Corea F3 | 2018/06/18 03:30 | Seong-Gook Oh v Seong Chan Hong | 6-7,0-6 |
| ITF Corea F2 | 2018/06/13 03:05 | Seong-Gook Oh v Chukang Wang | 6-1,5-7,7-5 |
| ITF Corea F1 | 2018/06/05 01:00 | Seong-Gook Oh v Jae-Won Choi | 1-6,5-7 |
| Challenger Busan - Qual. | 2018/05/12 02:15 | Jeamoon Lee v Seong-Gook Oh | 7-6,6-3 |
| Challenger Seoul - Qual. | 2018/04/28 02:50 | Ji Hoon Son v Seong-Gook Oh | 6-3,6-3 |
| ITF Corea F3 | 2018/06/21 03:20 | Sanhui Shin v Cheong-Eui Kim | 6-7,3-6 |
| ITF Corea F3 | 2018/06/19 08:30 | Yeongseok Jeong v Sanhui Shin | 6-4,5-7,2-6 |
| ITF Corea F3 - Qual. | 2018/06/18 03:30 | Seon Yong Han v Sanhui Shin | 1-6,6-2,4-6 |
| ITF Corea F3 - Qual. | 2018/06/17 04:30 | Sanhui Shin v Minjong Park | 6-0,6-7,6-4 |
| ITF Corea F3 - Qual. | 2018/06/16 03:30 | Sanhui Shin v Byeonghun Kim | 6-2,6-0 |
| Challenger Seoul - Qual. | 2018/04/29 02:00 | Luke Saville v Sanhui Shin | 6-1,6-1 |
| Challenger Seoul - Qual. | 2018/04/28 01:30 | Sanhui Shin v Dong Ju Kim | 6-4,6-4 |
| ITF Thailandia F4 | 2016/12/11 06:10 | Sanhui Shin v Andrei Levine | 7-6,6-3 |